JPH02220720A - Manufacture of metallic plate wall panel having flange - Google Patents

Abstract

PURPOSE:To manufacture a wall panel having a high commodity value and an excellent corrosion resistance by forming it by notching corner parts of four corners of a square blank in a large circular arc shape. CONSTITUTION:Corner parts of four corners of a rectangular or square blank are notched in a circular arc being larger by 11-20mm than the dimension of a punch by a punch corner tip part, and thereafter, a metallic plate wall panel having a flange is formed. Or it is formed by using jointly a notch of this blank and an auxiliary blank holder. This method is effective for forming not only a surface finish metallic plate using a fluororesin but also a steel plate having a painting film.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for processing surface-finished metal plates used for wall panels for building materials such as building exterior panels. Here, surface-finished metal plates are fluororesin-coated steel plates, fluororesin-laminated steel plates, etc., which have corrosion resistance made by baking or adhering a coating film containing fluororesin onto galvanized steel plates, stainless steel plates, aluminum plates, etc. This is a general term for coated steel sheets with even higher quality.

(Prior art) Wall panels used for building exterior panels, etc. are made by processing a surface-finished metal plate into a rectangular or square shape with a side length of 300 to 2,000 m and a depth of several degrees (Fig. 3). a
) is used by pasting together a number of wall panels 8 shown in FIG. Figure 3 (a), (b), (C
) is a schematic assembly diagram of the wall panel, where 8 is a surface-finished metal plate that will become the surface of the wall panel, 9 is the corner part, 10 is the sealing material, 11 is the flange part, and 12 is the part of the wall panel. It is a mounting frame. Also,
6 indicates the false side radius of the right side part, f indicates the false side radius of the corner part, and g indicates the molding depth of the corner notch part. Figure 3 (
In the gap between the wall panels 8 in b), the 7-rank parts 11 are overlapped and attached to the mounting frame 12. In this case, it is necessary to change the depth of the left and right flange portions 11 by the thickness of the plate so that both panels are flat. Also, apply sealant to this gap.
It is filled with 0 to protect the cut surface and improve its appearance.

The wall panel 8 has a better appearance and a higher commercial value as the false side radius of the right side part and the false side radius f of the corner part are smaller. However, the smaller e and f are, the higher the possibility that cracks will occur and the paint film will be damaged, which will impair the corrosion resistance that the wall panel 8 should originally have, and there are limits to the radii e and f. Among these, there is almost no difference in the limit of the temporary side radius e of the right side portion, regardless of whether the wall panel 8 is processed by bending or press forming, and the limit differs depending on the type of paint film and processing temperature. . The limit of the temporary side radius f of the corner portion 9 varies greatly depending on the type of coating film, processing temperature, and coloring method. Further, the deeper the molding depth g of the corner portion, the deeper the depth covered with the sealing material, which is advantageous against intrusion of rainwater and aging deterioration of the sealing material.

There are various ways to create wall panels. First, as shown in FIG. 4(&)K, a method can be considered in which the corner is cut only in a straight line, bent at the position of the dashed line 13, and then the corner portion is finished by welding.

FIG. 4 (&) is a schematic diagram of creating a wall panel when the corners of a rectangular blank are notched only with straight lines, and 13 is the bending position. However, in the method shown in Fig. 4(b) and (e), the corners do not match as shown in the figure by the bending radius, so not only are welds separated, but the paint film may be damaged due to the welding of the corners. Since it is very large, the surface needs to be finished again, and l! ! It is expensive and impractical.

Next, there is a method in which the blank is made into a rectangular or square shape and molded using a large press.

FIG. 5 is a schematic diagram of a corner part after molding when a rectangular blank is used, 14 is the shape of the flange part of the corner part, and 17 is a cutting line of an unnecessary part when assembled into a wall panel. In the method shown in Fig. 5, a pointed 7-rank part 14 remains at the corner after molding, which not only needs to be removed, but also requires the removal of the left and right flanges as shown in Fig. 3(b). A considerable amount of effort is required to mold the portion 11 by changing its depth, and the smaller the temporary side radius f of the corner portion, the greater the damage to the paint film, so the value of the radius f is limited to 11*tx. Ta.

(Problems to be Solved by the Invention) In view of production efficiency, it is desirable to manufacture wall panels by press molding. In this case, the product value will be higher if the temporary diameter f of the corner portion shown in FIG. 3(C) is made as small as possible, but as shown in FIG.
6. The damage to the paint film increases. In addition, the large molding depth g of the constricted portion 16 also prevents rainwater from flowing into the notch end when it is actually assembled as a wall panel and the sealant 10 is inserted as shown in FIG. 3(b). This can prevent deterioration of the corrosion resistance of the wall panel. The molding depth g of the constricted portion 16 needs to be L8 ms or more, according to research conducted by the present inventors, when considering peeling of the sealant due to changes over time.

However, the greater the molding depth g of the drawn portion 16, the greater the damage to the paint film of the drawn portion 16, especially at the corner portions 9.
The forming depth g of the drawing part 16 when the temporary side radius f is 10 m or less
It was difficult to make the distance 18 m or more.

(Means for Solving the Problems) As a result of various studies to solve these problems, the present inventors devised the method shown below. That is, (1) The four corners of the rectangular or square blank are sized 11 times smaller than the punch dimension at the tip of the punch corner.
~ J 隨 Cut out and form into a large arc shape (2) Cut out the four corners of the rectangular or square blank into an arc shape that is 11 to 20 fi larger than the punch dimension at the tip of the punch corner, and press the wrinkle holder at the corner. It is characterized by being molded with a mold that protrudes toward the punch side than the die in the part, and the depth from the surface is 18 mm or more (
Effect) The reason why the present invention allows the temporary radius f of the corner portion 9 to be 10 mm or less and the molding depth g of the corner portion to 18 mm or more is considered as follows.

The table of forming test results for surface-finished metal plates in the attached sheet shows the forming depth g of the corner part and the corner part when the corner notch is made as shown in Figure 1 and the shape of the notch on the length of one side is changed. The state of damage to the paint film was investigated. The molding depth g of the corner portion 9 was the shallowest depth of the corner notch. In addition, the evaluation of damage to the m-iron coating at the corner part 9 due to forming was as follows: stamping of the base metal (same as "cracking" in the column in the table), no cracking of the base metal, but painting that reached the base metal. There are six stages: damage to the film (extreme), large cracks in the paint film only (large), moderate cracks in the paint film only (medium), small cracks in the paint film only (small), and no cracks in the paint film only. Visual evaluation was performed. Corrosion resistance was also evaluated using salt spray, but the result was almost the same as the visual evaluation, and it was found that there is no problem with corrosion resistance as a wall panel if it is small or nonexistent on the Kamishi 6-level evaluation. .

The forming method includes simultaneous forming of the four corners by press forming (same as "simultaneous forming" in the column in the table), and a method of sequentially bending the four right sides and then press forming the four corners (divided forming). However, even with separate molding, if the method was devised, it was possible to achieve almost the same degree of damage to the paint film as with simultaneous molding. In addition, in the case of simultaneous molding, as shown in Figure 2 (a), middle), there is a method of forming with a mold in which the wrinkle presser protrudes toward the punch side from the die at the corner part (auxiliary wrinkle presser forming ) tests were also conducted. The results are shown in the table.

First, FIG. 6 shows a schematic diagram of a corner portion of a wall panel obtained by the method of the present invention. In FIG. 6, 11 is a flange portion on the right side, 15 is a notch portion, and 16 is a constricted portion. FIG. 7 is a schematic diagram showing a cross section taken along the line C-C at the corner of the 1X6 diagram and assembled into a wall panel with the sealant 10 attached. In Figure 7, 12 is the mounting frame, f
is the false side radius, and g is the molding depth of the corner portion. According to the method of the present invention, since the 7-rank part 11 on the right side has a notch in the drawing part 16 at the corner, it is easy to change the molding height on the left and right sides by the thickness of the plate, as shown in Fig. 5. There is no need to cut the 7th rank part of the corner, and the manufacturing cost is also reduced.

(Example) Next, the shape of the notch at the corner of the blank, which is the gist of the method of the present invention, will be explained using FIG. 1 and a table. In FIG. 1, 1 indicates a punch shape, 2 indicates a notch shape of a blank, and 3 indicates an intersection of an arc shape and a straight portion of the blank notch shape. In addition, a is the radius of the notch shape, b is the corner radius of the punch, C is the difference between the blank at the tip of the punch corner and the punch dimension, and d is the difference between the notch straight part of the corner and the punch dimension.

From the table, for the notch shape at the corner of the blank, the difference C between the blank and punch dimensions at the tip of the punch corner is 1.
If it is not more than 1 inch, the molding depth g of the corner part will be 18. Since the above cannot be ensured, the dimensional difference C needs to be 11W1111 or more. Further, if the dimensional difference C becomes 21 stitches or more, damage to the corner portion becomes large, so the dimensional difference C needs to be 20 m or less. The radius a of the corner notch may be greater than or equal to the sum of the punch corner dimension and the dimensional difference C.

The difference d between the notch linear portion of the corner and the punch dimension may be less than the radius a of the notch shape as long as it does not interfere with the shaping of the corner portion.

The corner notch shape 2 may be created by laser cutting, cutting method, etc., as long as it has a shape close to a circular arc (circular arc shape). In the notch shape 2 of the corner, the intersection point 3 of the circular arc shape and the straight part should be rounded with a radius of about 1 to 3 fi if possible, but there is no problem even if it is not rounded.

Furthermore, the effect of the auxiliary wrinkle suppressor, which is another key point of the method of the present invention, will be explained with reference to FIGS. 2(&) and (b) and the table. Figure 2('b) is a schematic diagram of the mold during molding, and 4
5 is a punch, 5 is a wrinkle presser, 6 is a die, 7 is an auxiliary wrinkle presser, and 8 is a surface-finished metal plate that will be the surface when it becomes a wall panel.

From the table, it can be seen that the mold shape during molding with the auxiliary wrinkle presser 7 causes less damage to the paint film. This is the drawing part 1 that is formed by making corner notches.
6 is released from the wrinkle suppressor earlier than the surrounding straight sides, so it is thought that this is to suppress the occurrence of wrinkles in the surface-finished metal plate due to large compressive deformation. Therefore, when the mold shape is equipped with the auxiliary wrinkle presser 7, the paint film is less damaged and the temporary side radius f of the corner portion can be made smaller. The auxiliary wrinkle presser 7 may be provided only at the corner portion, but if it is difficult to make a mold, the auxiliary wrinkle presser 7 may be attached to the entire inner circumference of the wrinkle presser 5. The auxiliary wrinkle holder 7 can be used with the punch 4 and the wrinkle holder 5 to the extent that it does not interfere with attaching the mold.
It is better to make it as large as the clearance allows.

Furthermore, there is no big difference in damage to the paint film whether the forming method is press forming (simultaneous forming) of the four corners or sequentially bending the four right sides and then press forming the four corners (divided forming). Either is possible.

(Effects of the Invention) This invention is extremely effective when manufacturing a wall panel using a surface-finished metal plate, and can be formed by the blank cutting method described in the claims or by the blank cutting method. By molding in combination with auxiliary wrinkle control, a wall panel with high commercial value and excellent corrosion resistance can be manufactured. Further, the present invention is effective not only for forming surface-finished metal plates using fluororesin, but also for forming coated steel plates having general paint films.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the method for cutting out the blank of the present invention, and Figure 2 (
a), (b) are schematic diagrams of the mold during molding, Figure 3 (a),
(b) and (C) are schematic diagrams of how to assemble the wall panel, and Figures 4 (a), (b), and (C) are schematic diagrams of how to create a wall panel when the corners of a rectangular blank are cut out using only straight lines. Figure 5 is a schematic diagram of the corner part after molding when a rectangular blank is used for molding, Figure 6 is a schematic diagram of the corner part after molding when the blank in Figure 1 is used for molding, and Figure 7
The figure is a schematic diagram of a case where a sealing material is applied to the cross section taken along the line CC in FIG. 6 and assembled as a wall panel. l...Punch shape, 2...Blank notch shape, 3
...Intersection of arc and straight part, 4...Punch, 5...
・Wrinkle press 1, 6...Die, 7...Auxiliary press, 8...Wall panel, 9...Corner part,
10...Sealing material, 11...7 rank part, work 2
...Mounting frame, 13...Bending forming position, 14...
Shape of 7th rank part, 15... Notch part, 16...
Squeezed portion, 17... Cutting line, a... Radius of notch shape,
b...Corner radius, C...Dimension difference, d...Dimension difference, e...False side brushing radius, f...False side radius of corner portion, g...Forming depth.

Claims (3)

[Claims] (1) Cut the four corners of a rectangular or square blank by 11 to 2 mm larger than the punch dimension at the punch corner tip.
A method for manufacturing a metal plate wall panel having a flange, which is characterized by cutting and forming a 0 mm large arc shape. (2) Cut the four corners of the rectangular or square blank by 11 to 2 mm larger than the punch dimension at the punch corner tip.
A method for producing a metal plate wall panel having a flange, which is characterized by molding with a mold having a notch in a large arc shape of 0 mm and a wrinkle retainer protruding toward the punch side from the die at the corner part. (3) A metal plate wall panel having a flange according to claim 1 or 2, characterized in that the outside radius of the wall panel is 5 to 10 mm and the depth from the surface is 18 mm or more. Production method.